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/lib/partman/update.d/99signal_ubiquity is in ubiquity 18.04.14.

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#! /bin/sh -e

. /usr/share/debconf/confmodule

dev=$1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
name=$8

db_set ubiquity/partman-rebuild-cache "$dev//$id"

exit 0